Utilization of Solid Waste from Foundries Industry as Cementitious Binder in Solidification

Abstract

Solid waste from moulding sand and baghouse filter are wastes generated from foundries industry. The preliminary study was carried out in order to classify types of solid waste by testing the leaching of heavy metal. It was found that these wastes are non-hazardous waste. Furthermore,these wastes were pozzolanic materials indicated by the combination of silicon oxide, aluminum oxide, and iron oxide were more than 70% and sodium oxide was less than 1.5%. Normally, solid waste from moulding sand and baghouse filter were recycled back in the moulding process and dumped in open land, respectively. In this study, fine particle of solid waste from baghouse filter was selected to determine its possibility for utilization as cement binding mixture in solidification.

The suitable proportion of fine particle to cement to water for solidification in landfill was 80 : 20 : 0.27 by weight. The compressive strength of solidified material was 166 kg/cm’ after the 28th day curing. This proportion was used for solidified mercury obtained from COD analysis sludge. It was found that mercury sludge was stabilized up to 0.8% by weight. The leaching test of mercury did not exceed the criteria standard.

Keywords : Utilization / Mercury stabilization / Solidification / Pozzolan / Fine particle from baghouse filter / Foundries industry